An activity series of metals is a table of metals arranged in the order of their decreasing chemical activity or the ease at which the metal will give up one or more electrons to form positive ions. This table is similar to the electrochemical series of elements. For example if you take the group of metals magnesium, mercury and nickel, magnesium is the most reactive and mercury the least. To empirically determine which of these metals is more reactive, place a piece of the metal in a salt solution of the other. The more reactive metal will replace the less reactive metal and the less reactive will appear in the solid form. The reactive metal has been oxidized; the less reactive metal has been reduced. Kit Includes: 45 pieces Copper Metal 45 pieces Zinc Metal 45 pieces Magnesium Metal 45 pieces Lead Metal 1 x 50mL Copper Nitrate, 0.1M 1 x 50mL Zinc Nitrate, 0.1M 1 x 50mL Magnesium Nitrate, 0.1M 1 x 50mL Lead Nitrate, 0.1M 1 x 2.15g Potassium Bromide 1 x 0.6g Potassium Bromate 1 x 25mL Sulfuric Acid, 1.0M 2 x 25mL Chlorine Water 2 x 25mL Iodine Water 2 x 25mL Sodium Bromide, 0.1M 2 x 25mL Potassium Iodide, 0.1M 2 x 25mL Sodium Chloride, 0.1M 2 x 75mL Mineral Oil 1 Empty Bottle (for Bromine Water) DOT Info: Small quantity exemption 173.4 THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only WARNING: This product can expose you to chemicals including Lead and lead compounds, Potassium Bromate and Strong inorganic acid mists containing sulfuric acid, which are known to the State of California to cause cancer and reproductive harm. For more information go to http://www.P65Warnings.ca.gov.